Today we started testing the jig for drilling the angle on Shopbot. Designed and cut by Mike Gittelsohn, the jig is basically a 2'x4' double-layered MDF bed with 9x2 symmetrical channels where 4' lengths of angle are placed and clamped by the third sheet of MDF that goes on top. Several dowels align the sheets relative to each other and to the Shopbot table.

Opened up the jig after drilling one 4' length:

Small error in X (about 0.03", we didn't zero the head properly):

The angle looks pretty good and might require no countersinking which would be a huge time saver:

The vibration problem when drilling aluminum on Shopbot needs more time and research. We decided to put in on the back burner for now, and get quotes from machine shops. The ETA for production angle is mid-March and the price will most likely be affected.